Product: 3500/40M Monitoring Module (Assembly: 176449-01) with 125680-01 Programming Cable
Category: Monitor Module for Speed (RPM), Zero Speed, and Overspeed in the Bently Nevada 3500 System
Overview:
The 3500/40M is a dedicated Speed Monitoring Module within the Bently Nevada 3500 Machinery Protection System (MPS). The assembly part number 176449-01 refers to a specific, factory-built configuration of this module, which monitors rotational speed and provides critical alarm functions. It must be paired with a compatible sensor, typically a magnetic pickup (MPU) or proximity probe acting as a Keyphasor. The 125680-01 is an associated RJ45 programming cable used to configure the module's setpoints and parameters via the 3500 Rack Interface. Together, they form a complete solution for protecting machinery from underspeed, overspeed, and loss-of-speed conditions.
Key Parameters & Specifications
| Parameter | Specification / Description |
|---|---|
| Module Function | Dual-channel Speed (RPM), Zero Speed, Overspeed, and Rate-of-Change Monitor. |
| Input Signal | Accepts signals from Magnetic Pickups (MPUs) or Proximity Probes (Keyphasor). Input is a raw AC sine wave or pulse train whose frequency is proportional to speed. |
| Speed Range | Typically 0 to 99,999 RPM, configurable per application. |
| Alarm Functions | Provides programmable, time-delayed relay outputs for: • Overspeed (User-definable setpoint) • Zero Speed / Under Speed • Rate-of-Rise (Acceleration) • Signal Loss / Module Fault |
| Channels | Two independent monitor channels in a single slot. Each can monitor a separate speed source or be configured for voting logic (e.g., 2-out-of-3 for overspeed trip). |
| Outputs | • Four dedicated alarm relays per channel (Common, Alert, Danger, Aux). • Buffered analog output (4-20 mA or 1-5 V) proportional to speed. • Digital communication to the 3500 framework for display and system integration. |
| Power Supply | Powered by the 3500 rack backplane (+5V, ±15V). |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) – Standard for 3500 rack-mounted electronics. |
| Mounting | Slides into any monitor slot (Slots 3-16) of a 3500/15, 3500/25, or similar rack. |
| Configuration | Configured via the 3500 Rack Interface or handheld programmer using the 125680-01 RJ45 Configuration Cable. |
| Module Dimensions (3500/40M) | Standard 3500 single-slot module: ~193 mm (7.6 in) H x ~44 mm (1.73 in) W x ~284 mm (11.2 in) D. |
| Module Weight (3500/40M) | Approx. 0.9 kg (2.0 lbs). |
| Cable (125680-01) | RJ45 to RJ45 straight-through data cable, typically 1-2 meters (3.3-6.6 ft) long. |
| Cable Weight (125680-01) | Negligible (less than 0.1 kg / 0.22 lbs). |
| Key Software Features | Programmable time delays, voting logic, self-test, and extensive diagnostics. |
Primary Application Scenarios
Overspeed Protection for Prime Movers:
Critical Protection: The primary application is to provide a hardwired, failsafe overspeed trip for steam turbines, gas turbines, and hydro turbines to prevent catastrophic mechanical failure.
Zero Speed / Turning Gear Monitoring:
Ensures a turbine or compressor rotor is rotating before admitting steam/gas and verifies it has stopped completely before initiating maintenance. Monitors barring gear (turning gear) operation.
Compressor and Pump Anti-Surge Control Support:
Provides a reliable speed signal for calculating compressor head/flow in anti-surge control systems and for pump performance monitoring.
General Rotating Equipment Speed Monitoring:
Monists the running speed of motors, fans, gearboxes, and extruders for process control and alarm indication of under-speed conditions (e.g., belt breakage, coupling failure).
Turbine Start-up/Coast-down Monitoring:
Used to monitor rate-of-change of speed during critical startup and shutdown phases to avoid thermal stress.
Cross-Industry Critical Machinery:
Power Generation: Main turbine-generator overspeed protection (AST - Automatic Stop Trip).
Oil & Gas: Gas turbine-driven compressors and pumps.
Marine: Propulsion turbine and diesel engine speed monitoring.
Chemical/Petrochemical: Critical reactor stirrer drives and turbine-driven compressors.
Critical Note: The 3500/40M (176449-01) is a monitoring module only. It requires:
A properly installed speed sensor (e.g., MPU or proximity probe).
Installation in a powered 3500 Series Rack with a power supply (e.g., 3500/05) and a framework interface module (e.g., 3500/15).
Configuration via the 125680-01 cable and software to set the specific RPM setpoints, time delays, and logic for the application.
Always refer to the factory configuration record for assembly 176449-01 and the 3500/40M firmware manual for definitive specifications and safety-related application guidelines.
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